Australia country information

Common names: Clarence Galaxias
Occurrence: endemic
Salinity: freshwater
Abundance: common (usually seen) | Ref: Crook, D.A. and A.C. Sanger, 1998
Importance: | Ref:
Aquaculture: | Ref:
Regulations: protected | Ref: Crook, D.A. and A.C. Sanger, 1998
Uses: no uses
Comments: Known only from Clarence Lagoon and its tributaries, Tasmania (Ref. 7300). Common within its range. No longer present in the lower part of the Clarence River catchment (Ref. 30189). As of 1998, only six breeding populations are known to occur in the headwaters of the Clarence River (Ref. 30189). The spread of the introduction of the predatory brown trout, Salmo trutta, in the river has fragmented the distribution of this species (Ref. 30189 and 48787). However, it remains quite common within its current range, including one population that exists in sympatry with brook charr, Salvelinus fontinalis. Conservation action: This species is protected under national and state legislation and collection requires a special permit (Ref. 36189). Periodic surveys have been conducted to assess the isolation of populations from brown trout (Ref. 30189). The habitats containing the two largest populations of Clarence galaxias are well reserved for nature conservation (Ref. 30189). A recovery plan has been prepared for the species (Ref. 30189, 36755). Also Ref. 44894. Status of threat: Endangered (Ref. 48666, 51305).
National Checklist:
Country Information: https://www.cia.gov/library/publications/resources/the-world-factbook/geos/as.html
National Fisheries Authority: http://www.csiro.au/
Occurrences: Occurrences Point map
Main Ref: Allen, G.R., 1989
National Database:

Common names from other countries

Johnstoni galaks, 乔氏南乳鱼, 喬氏南乳魚, ... more

Classification / Names Common names | Synonyms | Catalog of Fishes(genus, species) | ITIS | CoL | WoRMS | Cloffa

Teleostei (teleosts) > Galaxiiformes (Southern smelts) > Galaxiidae (Galaxiids) > Galaxiinae
Etymology: Galaxias: Greek, galaxias, ou = a kind of fish (Ref. 45335).

Environment: milieu / climate zone / depth range / distribution range Ecology

Freshwater; demersal. Temperate; 42°S - 43°S

Distribution Countries | FAO areas | Ecosystems | Occurrences | Point map | Introductions | Faunafri

Oceania: known only in Clarence Lagoon and tributaries and the upper reaches of the Clarence River, which is part of the Derwent River system of Tasmania, Australia.

Size / Weight / Age

Maturity: L_m ? range ? - ? cm
Max length : 14.0 cm SL male/unsexed; (Ref. 44894); common length : 7.5 cm SL male/unsexed; (Ref. 5259); max. published weight: 20.00 g (Ref. 30189)

Short description Morphology | Morphometrics

Dorsal spines (total): 0; Dorsal soft rays (total): 10-12; Anal spines: 0; Anal soft rays: 11 - 13; Vertebrae: 53 - 54. Scales completely absent (Ref. 30189). Dark brown dorsal surface, irregular dark brown bars and bands extending down sides, ventral surface yellow-cream in color (Ref. 30189).

Facultative air-breathing in the genus (Ref. 126274); Found in shelter of rocks and boulders in lacustrine habitats, also found in swamps and streams draining in and out of lakes (Ref. 44894). Adults occur in the rocky margin of Clarence Lagoon, its outlet stream and several tributaries that flow into the lake. Adults feed on benthic crustaceans while juveniles feed partly on planktonic crustaceans, and insects and their larvae (Ref. 30189, 44894). Very secretive species, darts for cover under boulders if disturbed. The entire life cycle (may live for up to four years) takes place in fresh water. Adults move into inlet streams to spawn in spring. The demersal eggs take about 2 months to hatch. Fry reside in open surface waters of the lake (Ref. 44894).

Life cycle and mating behavior Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae

Oviparous. Spawn in spring (Ref. 30189).

Main reference Upload your references | References | Coordinator : Berra, Tim M. | Collaborators

Allen, G.R., 1989. Freshwater fishes of Australia. T.F.H. Publications, Inc., Neptune City, New Jersey. (Ref. 5259)

IUCN Red List Status (Ref. 130435)

Endangered (EN) (B1ab(iii,iv)+2ab(iii,iv)); Date assessed: 11 February 2019

CITES (Ref. 128078)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

Harmless

Human uses

FAO(Publication : search) | FishSource |

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Estimates based on models

Phylogenetic diversity index (Ref. 82804): PD₅₀ = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].

Bayesian length-weight: a=0.00490 (0.00205 - 0.01170), b=3.12 (2.91 - 3.33), in cm Total Length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245).

Trophic level (Ref. 69278): 3.2 ±0.40 se; based on food items.

Resilience (Ref. 120179): Medium, minimum population doubling time 1.4 - 4.4 years (tm=2; Fec=300).

Fishing Vulnerability (Ref. 59153): Low vulnerability (10 of 100).

Galaxias johnstoni Scott, 1936